Title:
OPTICAL INTENSITY ATTENUATOR AND OPTICAL INTENSITY ATTENUATING METHOD
Document Type and Number:
WIPO Patent Application WO/1999/017472
Kind Code:
A1
Abstract:
An optical intensity attenuator and an optical intensity attenuating method for outputting a signal light component having a desired optical intensity by attenuating a pulse-like light surge by a simple structure comprising a small number of optical parts and circuits. A signal light is outputted on receiving a signal light containing a pulse-like surge component, and the intensity of the surge component is attenuated by a desired value. There are two typical methods: (1) a method in which at least one of substrate and an optical waveguide formed on the substrate is made of a material having a nonlinear optical effect, the refractive index of the optical waveguide for the signal light is smaller than that of the substrate for the harmonics of the signal light, and therefore a portion of the inputted signal light is converted in wavelength into a light having a shorter wavelength than that of the signal light and scattered; and (2) a method in which a polar molecule liquid containing polar molecules is used to scatter at least a portion of the signal light.
Inventors:
ICHIKAWA JUNICHIRO (JP)
NAGATA HIROTOSHI (JP)
HIGUMA KAORU (JP)
MINOWA JUNICHIRO (JP)
OGATA TAKAAKI (JP)
TANEDA YASUHISA (JP)
NAGATA HIROTOSHI (JP)
HIGUMA KAORU (JP)
MINOWA JUNICHIRO (JP)
OGATA TAKAAKI (JP)
TANEDA YASUHISA (JP)
Application Number:
PCT/JP1998/004346
Publication Date:
April 08, 1999
Filing Date:
September 29, 1998
Export Citation:
Assignee:
SUMITOMO OSAKA CEMENT CO LTD (JP)
NEC CORP (JP)
ICHIKAWA JUNICHIRO (JP)
NAGATA HIROTOSHI (JP)
HIGUMA KAORU (JP)
MINOWA JUNICHIRO (JP)
OGATA TAKAAKI (JP)
TANEDA YASUHISA (JP)
NEC CORP (JP)
ICHIKAWA JUNICHIRO (JP)
NAGATA HIROTOSHI (JP)
HIGUMA KAORU (JP)
MINOWA JUNICHIRO (JP)
OGATA TAKAAKI (JP)
TANEDA YASUHISA (JP)
International Classes:
G02F1/35; G02F1/365; G02F1/01; G02F1/37; G02F1/377; (IPC1-7): H04B10/02; H01S3/10; G02F1/37
Foreign References:
| JPH0818138A | 1996-01-19 | |||
| JPH09297286A | 1997-11-18 | |||
| JPH04104232A | 1992-04-06 |
Other References:
CHEN H. M., SCHELLY Z.A.: "EXPERIMENTAL DETERMINE OF THE EFFECT OF POLARIZATION OF HEATING LASER PULSE ON THE CHARACTERISTICS DECAY TIME CONSTANT AND FOCAL LENGTH OF THERMAL LENSES, AND ON THE THERMAL DIFFUSIVITIES IN PURE LIQUIDS.", CHEMICAL PHYSICS LETTERS, ELSEVIER BV, NL, vol. 224., 1 January 1994 (1994-01-01), NL, pages 61 - 68., XP002915326, ISSN: 0009-2614, DOI: 10.1016/0009-2614(94)00520-6
See also references of EP 0946005A4
See also references of EP 0946005A4
Attorney, Agent or Firm:
Shiga, Masatake (Takadanobaba 3-chome Shinjuku-ku Tokyo, JP)
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